Missing arms in bodyslide and invisible arms in game

[SRG212]

Hello! I was having issues with my or the npc's skin clipping through this outfit. I edited it in outfit studio, but now the arms are missing, and if the dress is worn in game the arms are just invisible. 

Here's a rundown of what I did:

1) Opened Bodyslide, selected the outfit, then opened it in Outfit Studio. 

2) I loaded my bodyslide preset and saw that skin was poking through the leg and chest areas. 

3) I decreased the volume of the mesh in the affected areas.

4) I saved the project when I was done (but did not tick "copy reference shape").

 

Can anyone tell me what I potentially did wrong here? Any help would be very much appreciated. Thanks!